Thirty-one percent of Food that is Grown, Shipped or Sold is Wasted

· Supermarket chains in Britain have done away with expiration dates on produce

· Trash bins equipped with radio-frequency identification sensors that weigh exactly how much food waste each household tosses each month

Food waste rotting in a landfill produces methane gas, which quickly heats up the planet. Worldwide, food waste accounts for 8 to 10 percent of global greenhouse gas emissions, at least double that of emissions from aviation.

A lot of it doesn’t need to be there: Thirty-one percent of food that is grown, shipped or sold is wasted. To slow global warming and feed people, governments and entrepreneurs are coming up with different ways to waste less food.

In California, grocery stores must donate food that’s edible but would otherwise be trashed; supermarket chains in Britain have done away with expiration dates on produce; and in South Korea, a campaign to end food waste in landfills has been underway for nearly 20 years.

Food waste in South Korea declined from nearly 3,400 tons a day in 2010 to around 2,800 tons a day in 2019. In the latest experiment, the government has rolled out trash bins equipped with radio-frequency identification sensors that weigh exactly how much food waste each household tosses each month.